20
12 16 15 14 11 17 20 13 19 18 
15 14 20 19 17 16 18 13 12 11 
15 13 18 16 14 19 11 17 12 20 
16 11 14 17 13 19 12 20 15 18 
16 19 17 15 20 14 12 11 13 18 
17 15 19 16 14 11 20 12 13 18 
12 19 18 16 14 15 11 20 17 13 
20 14 11 12 15 19 13 18 17 16 
18 17 13 15 16 14 12 19 20 11 
13 19 17 12 18 11 14 16 15 20 
7 3 8 6 1 2 10 9 4 5 
4 1 5 7 9 8 10 2 3 6 
7 9 6 10 1 4 3 5 2 8 
9 7 10 2 8 5 1 3 6 4 
6 4 9 3 1 2 8 5 10 7 
3 7 1 6 2 4 10 5 9 8 
10 6 5 2 3 4 9 8 1 7 
3 1 9 7 6 4 8 2 10 5 
6 8 7 9 4 1 5 3 10 2 
1 9 7 2 3 10 6 5 4 8 
forbidden 1 13
forbidden 1 14
forbidden 1 15
forbidden 1 20
forbidden 2 16
forbidden 2 19
forbidden 2 20
forbidden 3 19
forbidden 3 20
forbidden 4 12
forbidden 4 13
forbidden 4 14
forbidden 4 16
forbidden 5 15
forbidden 5 17
forbidden 6 11
forbidden 6 18
forbidden 6 20
forbidden 7 11
forbidden 7 13
forbidden 8 13
forbidden 8 14
forbidden 8 16
forbidden 9 11
forbidden 9 13
forbidden 9 14
forbidden 9 19
forbidden 9 20
forbidden 10 12
forbidden 10 16
forbidden 10 18
forbidden 10 19